Apparatus for turning concave rolls



Patented Get. 9, 193 4 UNITED" STATES APPARATUS FOR TURNING CONCAVEROLLS Theodore W. Glynn, Kingsport, Tenn, assignor to Blue Ridge GlassCorporation, Kingsport, Tenm, a corporation of New York ApplicationFebruary 18, 1933, Serial No. 657,436

2 Claims.

This invention relates to an apparatus for the turning of concave rolls,with especial reference to the type of roll used considerably in themetal and glass industries where very hot or semi- 5 molten metal isrolled to sheet form. It has been found desirable in certain of suchprocesses to form the sheets slightly thicker at their longitudinalcenters in order to allow for the flow of metal after rolling, and forcontraction of the sheet as it cools. This formation necessitates rollsdesigned in such manner that their longitudinal surfaces are concave,the diameter at the center being less that at the ends. Since rollssuitable for such Work must withstand great heat and pressure and stillretain their original accuracy, their manufacture has heretofore been adifficult and expensive matter requiring intricate and costly apparatus.It is the purpose of this invention to provide an apparatus forproducing these rolls which will be more simple, economical andaccurate.

It is a second object to provide apparatus of the kind described bywhich any degree of concavity may be obtained by a simple adjustment andby which the desired curve may be produced in a single operation.

With these and other objects in mind, to be developed as the descriptionproceeds, reference is made to the accompanying drawing, in which;

Figure 1 is a side elevation of the apparatus, showing a roll ready forturning;

Figure 2 shows a roll after turning, its concavity being somewhatexaggerated; and

Figure 3 is a sectional view taken along line 3-3 of Figure 1, showingin detail the driving and bearing members of the apparatus.

Referring more particularly to the drawing, a lathe is shown generallyat 10, having the usual driving pulley 11, bed 12, and tool rest 13driven by the worm 14. Since the lathe 10 is a standard apparatus andnot a part of this invention, it is illustrated only in sufficientdetail to make clear its connection with the invention.

The roll 15 to be worked is supported at one end in a specially designedchuck 16, best shown in Figure 3 and to be described in detailhereinafter. At the opposite end the roll 15 is carried in a bearingmember 17 having a vertical adjustment shown diagrammatically at 18. Itwill be noted that roll 15 is positioned so that its axis is notparallel to the bed 12 which determines the path of the tool. Bymanipulation of adjustment 18' the end of roll 15 may be raised orlowered to effect any desired angle, within practicable limits, betweenthe axis of the roll,

shown at 19, and the horizontal plane in which the cutting edge of thetool travels, shown at 20, Figure 1. Thus the tool travels in a' planeangularly displaced from the axis of the roll, and as will readily beseen this displacement causes the tool to cut to different depths as itmoves along the roll, the variation causing a proportional variation inthe concavity to be produced. To obtain uniformity at the longitudinalends of the roll, it is so adjusted that the line of movement of thetool crosses the axis of the roll at the exact longitudinal center ofthe roll, such center being shown at 21. Thus at 21 the tool willpresent its cutting edge directly horizontal to the axis of the roll,while as it is carried along a path parallel to the bed 12 of the lathethe cutting edge will be progressively above or below the axis of theroll as it proceeds from the center 21 to the position indicated at 22,Figure 1, corresponding to position 23 at the opposite end of the roll.The resulting roll is shaped as is shown at 24 in Figure 2, thecurvature being exaggerated as stated.

In order that the process described may be carried out on any lathe,there is provided the attachment shown in Figure 3. The roll 15 beingadjusted so that its axis is out of alignment with the center line ofthe spindle of the lathe, it is obvious that the ordinary bearing meanswould be impracticable. there is provided a self-aligning ball bearingof the adapter sleeve type, having a tapered sleeve 25 clamped in placeover the small end 26 of the roll 15. This clamping action is secured bya threaded ring or nut 2'7 which also forces into place on the sleeve 25the inner race 28 of the ball bearing. The chuck 16 is provided withadjustable jaws 29 by means of which the outer race 30 of the bearing iscentered. In order to drive the roll a dog 31 is clamped about it sothat one end of the dog will contact one of the jaws 29. It will be seenthat the play of the roll, due to its axial displacement, will be takenup within the ball bearing.

I claim:

1. Apparatus for turning a concave roll which comprises a lathe having abed, a tool carrier adapted to travel a path parallel to the axis of thebed, a chuck, means for centering one end of the roll and for drivingthe same, such means comprising a universal bearing associated with thechuck, a dog providing a driving connection between the chuck and theroll, and adjustable bearing means for the other end of the roll To meetthis difficulty a chuck, and means associated with the chuck forcentering the other end of the roll and for driving the same, such meanscomprising a universal ball bearing adapted to .be centered in the chuckand secured thereto and to the roll, and a dog providing a drivingconnection between the chuck and the roll, 7

V THEOPORE W "GLYNN.

